CONTEMPORARY AMPEREX TECHNO COM is a security (CUSIP Y1R48E113) tracked across SEC portfolio filings. 1 institutional managers reported $854K on Form 13F as of 2026-06-30.
| Manager | Location | Value | Shares |
|---|---|---|---|
| ESSEX INVESTMENT MANAGEMENT CO LLC | BOSTON, MA | $854K | 9,539 |